1. High temperature resistant coating This kind of coating can improve the high temperature working conditions of the base parts, and can withstand the chemical or physical decomposition of high temperature strips or chemical damage due to corrosion. Atmospheric oxidation resistant coating. This coating protects the substrate from damage due to high temperature oxidation. The melting point of the coating is higher than the operating temperature, and it has low vapor pressure at the operating temperature. The coating is not required to withstand mechanical wear. Gas resistant coating. Such coatings protect the substrate from exposure to high-temperature corrosive gases. Consideration must be given to preventing the formation of adsorbed oxides when the gas reacts with the coating, or to forming brittle components or penetrating the coating to erode the substrate. The coating is not required to withstand mechanical impact or wear. High temperature (above 850℃) erosion resistance coating. This kind of coating can withstand high temperature as well as particle erosion. High-speed particles and high-pressure gases at high temperatures form a variety of harsh environments, so the coating must be able to withstand erosion caused by moving sharp and hard particles. When the erosion Angle of particles is less than 45o, abrasive wear occurs along the surface, so the coating is required to have high hardness; When the erosion Angle of particles is greater than 45o, the coating is required to have high toughness. Thermal barrier coating. This kind of coating has low thermal conductivity, which can prevent the base material from reaching its melting point, and also has the effect of transferring radiant heat. 2, corrosion resistance to molten metal coating This kind of coating can withstand the corrosion of molten metal, and does not moisten the molten metal. Such as resistance to melting of zinc, aluminum, steel and iron, and copper coating.
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